2157201722 has 16 divisors (see below), whose sum is σ = 3486316680. Its totient is φ = 995172672.

The previous prime is 2157201703. The next prime is 2157201737. The reversal of 2157201722 is 2271027512.

It can be written as a sum of positive squares in 4 ways, for example, as 1974113761 + 183087961 = 44431^2 + 13531^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42068 + ... + 78000.

Almost surely, 2^2157201722 is an apocalyptic number.

2157201722 is a deficient number, since it is larger than the sum of its proper divisors (1329114958).

2157201722 is a wasteful number, since it uses less digits than its factorization.

2157201722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38257.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 2157201722 is about 46445.6857199891. The cubic root of 2157201722 is about 1292.1023591612.

The spelling of 2157201722 in words is "two billion, one hundred fifty-seven million, two hundred one thousand, seven hundred twenty-two".